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Ratnaningsih Ratnaningsih
Badan Standardisasi Nasional
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DEVELOPMENT OF OFFICIAL INDONESIA STANDARD TIME : TEMPERATURE CONTROL SYSTEM FOR CAESIUM ATOMIC CLOCK Windi Kurnia Perangin-Angin; Mohamad Boynawan; Ratnaningsih Ratnaningsih
Instrumentasi Vol 45, No 2 (2021)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v45i2.242

Abstract

Every country should have an official time standard which called local coordinated universal time, UTC(k). Badan Standardisasi Nasional (BSN) has developed an official standard time, namely UTC(IDN) which is used as Indonesia Standard Time. The UTC(IDN) contributes to calculation of coordinated universal time (UTC). In order to generate the UTC(IDN), the output of 1 pulse per second signal of caesium atomic clock is utilized as the actual signals of this standard. A distribution amplifier is used to distribute the signal. Combination of time transfer system (TTS-3) and GPS are employed for comparison of UTC and UTC(IDN). TTS-3 automatically calculated the difference and it is steered by using certain algorithm. Time synchronization to the standard can be conducted through network time protocol (NTP) server, i.e., ntp.bsn.go.id. The time can be automatically synchronized using internet time or certain program at each computer or machine. The results of this work show that the time differences between UTC – UTC(IDN) vary from 43.2 ns to 1729.9 ns. UTC(IDN) has frequency and time stability of 3.6 x 10-14 Hz/Hz per 5 days and 3.1 ns per 5 days, respectively which are in good agreement to the international time reference. A shielding chamber with temperature control system has been built to keep the ambient temperature of caesium atomic clock at (23 ± 1) ᵒC. It can be concluded that BSN has been developing and disseminating the UTC(IDN) as an Indonesia Standard Time that can support the regulation of time synchronization in Indonesia. A new temperature control system is proposed to stabilize the ambient temperature of caesium atomic clock. The temperature control system supports an accurate and stable UTC(IDN).
MEASUREMENT UNCERTAINTY OF THE OPTICAL WAVELENGTH CALIBRATION 633 nm BY BEAT FREQUENCY MEASUREMENT METHODS Asep Hapiddin; Yulita Ika Pawestri; A. M. Boynawan; Ratnaningsih Ratnaningsih
Instrumentasi Vol 44, No 2 (2020)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v44i2.220

Abstract

Measurement traceability is one of the critical aspects in metrology area. The measurement uncertainty had been evaluated to assure reliability of the optical wavelength calibration system for stabilized He-Ne laser 633 nm in SNSU-BSN. Beat frequency measurement was applied as a calibration method by utilizing KIM-1 as a reference standard that traceable to SI unit through CCL-K11 key comparison. Best measurement capability declares with a relative uncertainty of ±1.3×10-10 by excluding UUC effect. The calibration replica was performed as a validation process, dual mode laser head Agilent 5519B took a role as UUC. As calibration result, beat frequency of KIM-1 and UUC is (122.931±0.060) MHz. Among all of the uncertainty sources, KIM-1 uncertainty most significant influence to the beat frequency uncertainty and the optical wavelength of the UUC laser in vacuum condition. Based on the evaluation result, the calibration system of stabilized He-Ne laser can be validated and trace back with documented unbroken calibration chain to the primary standard of length, KIM-1 where established in SNSU-BSN.
PENINGKATAN KEMAMPUAN UKUR KALIBRASI SUMBER FREKUENSI DI BAWAH 10 HZ DAN SIMULASI DISEMINASINYA DALAM HEART RATE ELECTROCARDIOGRAM (ECG) Asep Hapiddin; A.M. Boynawan A.M. Boynawan; Ratnaningsih Ratnaningsih; Yulita Ika Pawestri; Brillyana Githanadi
Instrumentasi Vol 46, No 1 (2022)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v46i1.264

Abstract

Dalam upaya membangun ketertelusuran pengukuran alat dan fasilitas kesehatan, khususnyayang memiliki parameter pengukuran frekuensi, telah dilakukan penelitian dan kajian kalibrasisumber frekuensi rendah dalam rentang (0,1~10) Hz di Laboratorium SNSU Kelistrikan danWaktu BSN. Terdapat banyak alat kesehatan yang memiliki parameter pengukuran frekuensidalam rentang di bawah 10 Hz, salah satunya elektrokardiogram. Kemampuan pengukuran dankalibrasi di Laboraorium SNSU Kelistrikan dan Waktu, untuk sumber frekuensi adalah 10 Hz ~3,2 GHz. Oleh karena itu, sangatlah penting untuk membangun sistem kalibrasi danketertelusuran untuk sumber frekuensi pada rentang di bawah 10 Hz. Dalam penelitian ini, telahdibangun sistem kalibrasi sumber frekuensi dalam rentang (0,1~10) Hz yang tertelusur keStandar Nasional Frekuensi (NaFS), jam atom Cesium 133 HP5071A. Kemampuanpengukuran terbaik (BMC) didapatkan pada nilai 2,2×10-4 Hz ~ 3,2×10-5 Hz. Untukmendiseminasikan kemampuan pengukuran tersebut, dilakukan kajian studi kasus tentangkalibrasi elektrokardiogram (EKG) dan simulatornya sebagai alat kesehatan yang memilikiparameter frekuensi rendah. Namun, perlu dilakukan kalibrasi ECG simulator atau sumberfrekuensi rendah lainnya secara langsung menggunakan sistem kalibrasi yang telah dibangun.Kata Kunci: pengukuran frekuensi rendah, Standar Nasional Frekuensi, elektrokardiogram,ECG simulator
Co-Authors A. M. Boynawan A.M. Boynawan A.M. Boynawan Asep Hapiddin Brillyana Githanadi Mohamad Boynawan Windi Kurnia Perangin-Angin Yulita Ika Pawestri Yulita Ika Pawestri